.login{
  width: 100%;
  height: 100%;
  background: -webkit-linear-gradient(#03A7FB, #03A7FB); /* Safari 5.1 - 6.0 */
  background: -o-linear-gradient(#03A7FB, #03A7FB); /* Opera 11.1 - 12.0 */
  background: -moz-linear-gradient(#03A7FB, #03A7FB); /* Firefox 3.6 - 15 */
  background: linear-gradient(#03A7FB, #03A7FB); /* 标准的语法 */
}
.mark{
  position: absolute;
  left: 0;
  top: 0;
  width: 98/(1080/375)/50rem;
  height: 98/(1080/375)/50rem;
  margin-left: 28/(1080/375)/50rem;
  margin-top: 28/(1080/375)/50rem;
}
.mark img{
  width: 100%;
}
